Comment 4 for bug 1828892

@ddstreet There is no need to include the manpage correction (commit 71c9f49d730c8e)
since it reverts commit c7612b2 which does not exist in xenial systemd.

Initially issue #7875 was classified as feature request and not as a bug.
Upstream added modified the manpage (https://github.com/systemd/systemd/commit/c7612b20052d9151f60a96623b8743cbac88390d)
to clarify that 'is-active' command does not load units and therefore explain why an
alias unit is reported inactive while the aliased is reported active.
Later, when they realised it is a bug and fixed it they reverted c7612b2 with 71c9f49d730c8e.